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I’m concerned about your final statement that you can not reach focus on a star? The only way this would be possible is if there’s something obstructing the mirror movement or if backfocus is waaay off.
Check that nothing is obstructing or preventing mirror movement during focus such as faulty mirror locks, faulty focus rod, or screws used to anchor accessories that are too long.
Have you ever removed the secondary mirror or corrector plate? Might be worth checking that the secondary central screw is tight and holding things securely. Be very careful- if this lets go your secondary could drop.
Maybe send us a pic of your image train just to confirm back focus?
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